Core-bar



No. 6l4,958. Patented Nov. 29, I898. T. KEENAN.

GORE BAR.

(A licationfiled Apr. 8, 1898.)

(No Model.)

i f I p NITED STATES THOMAS KEENAN, OF ALLEGHENY, PENNSYLVANIA.

CORE -BAli.

SPECIFICATION forming part of Letters Patent No. 614,958, dated November29, 1898. Application filed April 8, 1898- Serial No. 676,966. (Nomodel.)

To all whom it may concern.-

Be it known that I, THOMAS KEENAN, a citizen of the United States,residing at Allegheny, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inCore-Bars; and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to the letters and figures ofreference marked thereon, which form a part of this specification.

This invention relates to core-bars for casting tubular articles, suchas cylinders, pipes, and the like; and its object is to provide for thequick and easy removal of the core after the article has cooled.

When solid cores are used, it requires a great deal of labor to dig themout, especially if the casting is a large one. Many kinds of collapsiblecore-bars have been proposed; but so far as I am aware they containvarious expensive mechanical devices for expanding and contracting them,and either for this reason or some other they are not in general use.

My invention is extremely simple, is not costly to make, has no movingparts to get clogged with dirt and worn out by the grit, is readilyunderstood by an unskilled workman, is durable in surface, can bequickly set up, and as quickly collapsed when it is to be removed.

In the accompanying drawings, Figure 1 is a perspective view of mycore-bar. Fig. 2 shows one section thereof. Fig. 3 shows the barcollapsed. Fig. 4 is a cross-section on line 4 4, Fig. 1.

The core-bar consists of a cylindrical shell composed of sections orsegments placed edge to edge and expanded tightly inside ofretaining-hooks, preferably by means of keys or wedges driven betweenthe abutting edges of two or more sections. In the drawings I have shownfour sections; but the number may be varied to suit the size of the coreor the convenience of the molder. Each section has a segmentalcylindrically-curved body portion A, with a heavy internal flange B ateach end, which may be attached to the body or made integral with it, aswill be readily understood. Section 1 has a rabbet at each end of theflanges, the faces of the rabbet being radial. Sections 2 and 3 havecorresponding and cooperating rabbets b at one end of their flanges, theother end being faced off oblique to a radial line, as clearly shown inFig. l. Section is preferably narrower than the others, and its flangesare cut to fit snugly between the oblique ends of the flanges onsections 2 and 3. In the abutting ends of the flanges on sections 2, 3,and 4 are cut longitudinal keyways b, those in section 4 being arrangedto register with those in the other sections when seotion 4 is in place.Keys or wedges C are fitted to said keyways and when driven in force thesections 2 and 3 away from the section 4, thereby expanding the core-barto its fullsize. The expansion is limited by hoops D, one at each end ofthe bar, fitting around the assembled sections and preferably receivedin rabbets b so that they may lie flush with the outer surface of thebar.

In operation the bar is set up on end in its expanded condition, and thecore is molded upon it. After the casting has cooled sufficiently thekeys are knocked out, allowing Y section 4 to be moved inwardly and thenlifted out. The other sections can then be swung inward and removed. Inheavy work rings or eyes 19 may be provided for the attachment ofhoisting apparatus to lift the sections out of the mold.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

1. A collapsible core-bar, consisting of segmental sections of thinmaterial, havingthick internal flanges extending across each end of thesections and abutting at their ends some on a radial line and others onan oblique line, and keys entering keyways cut lengthwise in theabutting faces of two or more of said flanges, substantially asdescribed.

2. A collapsible core-bar, consisting of segmental sections havinginternal flanges abutting at their ends, the joints between some of saidflanges being radial and others being oblique to a radial line, and keysentering said non-radial joints, substantially as described.

3. A collapsible core-bar, consisting of seg mental sections havinginternal flanges abntfaces, ke ways b and rabbets Z)", keys 0 and tingat their ends, some of the joints being hoops D, substantially asdescribed. 1'0 rabbeted and others not, and keys entering In testimonywhereof I affix my signature registering keyways out in the non-rabbetedin presence of two Witnesses. 5 joints, substantially as described.

i. A collapsible core-bar, consisting of seglVitnesses: mental sectionshaving body portions A, in- SVILLIAM YELLOWBY, 13611131 flanges 13having la-bbets b oblique THOMAS J. XVHYTE.

THOMAS KEENAN;

